1/* arch/arm/plat-s3c64xx/irq-pm.c
  2 *
  3 * Copyright 2008 Openmoko, Inc.
  4 * Copyright 2008 Simtec Electronics
  5 *      Ben Dooks <ben@simtec.co.uk>
  6 *      http://armlinux.simtec.co.uk/
  7 *
  8 * S3C64XX - Interrupt handling Power Management
  9 *
 10 * This program is free software; you can redistribute it and/or modify
 11 * it under the terms of the GNU General Public License version 2 as
 12 * published by the Free Software Foundation.
 13 */
 14
 15#include <linux/kernel.h>
 16#include <linux/syscore_ops.h>
 17#include <linux/interrupt.h>
 18#include <linux/serial_core.h>
 19#include <linux/irq.h>
 20#include <linux/io.h>
 21
 22#include <mach/map.h>
 23
 24#include <plat/regs-serial.h>
 25#include <plat/regs-timer.h>
 26#include <mach/regs-gpio.h>
 27#include <plat/cpu.h>
 28#include <plat/pm.h>
 29
 30/* We handled all the IRQ types in this code, to save having to make several
 31 * small files to handle each different type separately. Having the EINT_GRP
 32 * code here shouldn't be as much bloat as the IRQ table space needed when
 33 * they are enabled. The added benefit is we ensure that these registers are
 34 * in the same state as we suspended.
 35 */
 36
 37static struct sleep_save irq_save[] = {
 38	SAVE_ITEM(S3C64XX_PRIORITY),
 39	SAVE_ITEM(S3C64XX_EINT0CON0),
 40	SAVE_ITEM(S3C64XX_EINT0CON1),
 41	SAVE_ITEM(S3C64XX_EINT0FLTCON0),
 42	SAVE_ITEM(S3C64XX_EINT0FLTCON1),
 43	SAVE_ITEM(S3C64XX_EINT0FLTCON2),
 44	SAVE_ITEM(S3C64XX_EINT0FLTCON3),
 45	SAVE_ITEM(S3C64XX_EINT0MASK),
 46	SAVE_ITEM(S3C64XX_TINT_CSTAT),
 47};
 48
 49static struct irq_grp_save {
 50	u32	fltcon;
 51	u32	con;
 52	u32	mask;
 53} eint_grp_save[5];
 54
 55static u32 irq_uart_mask[CONFIG_SERIAL_SAMSUNG_UARTS];
 56
 57static int s3c64xx_irq_pm_suspend(void)
 58{
 59	struct irq_grp_save *grp = eint_grp_save;
 60	int i;
 61
 62	S3C_PMDBG("%s: suspending IRQs\n", __func__);
 63
 64	s3c_pm_do_save(irq_save, ARRAY_SIZE(irq_save));
 65
 66	for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
 67		irq_uart_mask[i] = __raw_readl(S3C_VA_UARTx(i) + S3C64XX_UINTM);
 68
 69	for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
 70		grp->con = __raw_readl(S3C64XX_EINT12CON + (i * 4));
 71		grp->mask = __raw_readl(S3C64XX_EINT12MASK + (i * 4));
 72		grp->fltcon = __raw_readl(S3C64XX_EINT12FLTCON + (i * 4));
 73	}
 74
 75	return 0;
 76}
 77
 78static void s3c64xx_irq_pm_resume(void)
 79{
 80	struct irq_grp_save *grp = eint_grp_save;
 81	int i;
 82
 83	S3C_PMDBG("%s: resuming IRQs\n", __func__);
 84
 85	s3c_pm_do_restore(irq_save, ARRAY_SIZE(irq_save));
 86
 87	for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++)
 88		__raw_writel(irq_uart_mask[i], S3C_VA_UARTx(i) + S3C64XX_UINTM);
 89
 90	for (i = 0; i < ARRAY_SIZE(eint_grp_save); i++, grp++) {
 91		__raw_writel(grp->con, S3C64XX_EINT12CON + (i * 4));
 92		__raw_writel(grp->mask, S3C64XX_EINT12MASK + (i * 4));
 93		__raw_writel(grp->fltcon, S3C64XX_EINT12FLTCON + (i * 4));
 94	}
 95
 96	S3C_PMDBG("%s: IRQ configuration restored\n", __func__);
 97}
 98
 99static struct syscore_ops s3c64xx_irq_syscore_ops = {
100	.suspend = s3c64xx_irq_pm_suspend,
101	.resume	 = s3c64xx_irq_pm_resume,
102};
103
104static __init int s3c64xx_syscore_init(void)
105{
106	register_syscore_ops(&s3c64xx_irq_syscore_ops);
107
108	return 0;
109}
110
111core_initcall(s3c64xx_syscore_init);